Category Archives: Variable Reluctance Pressure Transducer

The Operation of, and Benefits Provided by, Our Variable Reluctance Pressure Transducer

All pressure transducers sense pressure from the outside mechanically and produce an electrical signal in response to these changes.

When it comes to the variable reluctance pressure transducer, a sensing diaphragm changes position with pressure, inductively changing the impedance of the two sensing coils. This change produces an electrical signal.

As the potential user of pressure transducers, you need to know what type of unit is best suited for your particular application. At Validyne Engineering, we can point you in the right direction to find the pressure transducer that matches your particular needs.

Let’s look at the Variable Reluctance Pressure Transducer

The VR pressure transducers we offer at Validyne Engineering consist of a flat diaphragm (magnetically permeable) supported between two coils. A magnetic field is produced between the coils and the diaphragm when an AC excitation is applied. The opposition to the lines of flux (called the reluctance) is determined by the air gap present between the two coils and the diaphragm. The coils are wired electrically as an inductive half-bridge.

In this arrangement, an AC signal is produced in direct proportion to the deflection of the diaphragm. This is how it works: with the diaphragm in a relaxed, or ‘zero’ state, position, the magnetic field between coil 1 and the diaphragm is balanced with the magnetic field between coil 2 and the diaphragm. So there is a gap produced depending on the position of the diaphragm and each coil. This produces an AC output voltage.

Particular benefits provided by the variable reluctance pressure transducer include:

  • Measurement of very low pressures
  • Low power consumption
  • Wet/Wet differential measurements
  • Suited for high levels of vibration
  • Fast Dynamic Response

The variable reluctance transducers we offer at Validyne Engineering have a track record of accuracy and reliability in various environments. Allow our team to guide you in selecting the best pressure transducer(s) for your particular application.